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CBSE Class 9 Answered

Each egde of a cube is increased by 20 percente. what is the percentage increase in the surface area of the cube ??
Asked by Sakshi | 03 Oct, 2013, 06:05: PM
answered-by-expert Expert Answer
Let original edge of cube = a
Surface area = 6a2
Edge of new cube = a + 20% of a = 6/5 a
Surface area of new cube = 6(6/5a)2
Increase in surface area = New - original / original * 100%
                                   = 6a2[(6/5)2 - 1] / 6a2 * 100%
                                   = 11/25 * 100%
                                   = 44%
 
Answered by | 03 Oct, 2013, 10:05: PM

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